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81.2=7(m+3.9)
We move all terms to the left:
81.2-(7(m+3.9))=0
We calculate terms in parentheses: -(7(m+3.9)), so:We get rid of parentheses
7(m+3.9)
We multiply parentheses
7m+27.3
Back to the equation:
-(7m+27.3)
-7m-27.3+81.2=0
We add all the numbers together, and all the variables
-7m+53.9=0
We move all terms containing m to the left, all other terms to the right
-7m=-53.9
m=-53.9/-7
m=7+2.5789473684211/3.6842105263158
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